Fix issue with etcd node name missing hostname

[brandond]

Proposed Changes

• Set ServerNodeName in snapshot CLI setup
• Raise error if ServerNodeName ends up empty some other way
• Fix status controller to use etcd node name annotation instead of prefix checking

Types of Changes

bugfix

Verification

Testing

Linked Issues

• k3s-server creates improper etcd member name #9521
• rke2-server creates improper etcd member name rancher/rke2#5482

User-Facing Change

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 42.93%. Comparing base (fa37d03) to head (764d85c).

Files	Patch %	Lines
pkg/etcd/etcd.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9522      +/-   ##
==========================================
- Coverage   49.32%   42.93%   -6.39%     
==========================================
  Files         154      154              
  Lines       13523    13526       +3     
==========================================
- Hits         6670     5808     -862     
- Misses       5609     6549     +940     
+ Partials     1244     1169      -75     

Flag	Coverage Δ
e2etests	?
inttests	39.50% <40.00%> (?)
unittests	15.96% <0.00%> (-0.01%)	⬇️

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